lanxin/css/components/banner-mobile.css

.banner {
  width: 100%;
  height: 9rem;
  background: black;
  position: relative;
  background-repeat: no-repeat;
  background-size: auto 100%;
  background-position: 50%;
}
.banner-title {
  height: 1.375rem;
  font-size: 1.25rem;
  font-weight: normal;
  color: #ffffff;
  position: absolute;
  line-height: 1.375rem;
  left: 50%;
  top: calc((9rem - 0.6875rem) / 2);
  transform: translate(-50%, 0);
}